EP0297040B1 - Process for weft insertion in a pneumatic multicolor loom and loom to execute that process - Google Patents

Process for weft insertion in a pneumatic multicolor loom and loom to execute that process Download PDF

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Publication number
EP0297040B1
EP0297040B1 EP88810399A EP88810399A EP0297040B1 EP 0297040 B1 EP0297040 B1 EP 0297040B1 EP 88810399 A EP88810399 A EP 88810399A EP 88810399 A EP88810399 A EP 88810399A EP 0297040 B1 EP0297040 B1 EP 0297040B1
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EP
European Patent Office
Prior art keywords
weft
picking
yarn
entry
nozzle
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EP88810399A
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German (de)
French (fr)
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EP0297040A1 (en
Inventor
Robert Bucher
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Sulzer AG
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Gebrueder Sulzer AG
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    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
    • D03D47/34—Handling the weft between bulk storage and weft-inserting means
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
    • D03D47/28—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed
    • D03D47/30—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed by gas jet
    • D03D47/3026—Air supply systems
    • D03D47/3033—Controlling the air supply
    • D03D47/3046—Weft yarn selection

Definitions

  • the invention relates to a method for inserting weft threads into a pneumatic multi-color weaving machine (siche ZBGB-A-2 151 266), in which a thread store is available for each weft color, wherein before the insertion of a weft thread of a certain weft color, this is done by means of a thread stopper is held and is held stretched by a holding air flow in an entry channel of a multicolor entry nozzle.
  • the invention further relates to a pneumatic multi-color weaving machine for performing the method.
  • a weft thread that is currently not to be inserted can be held in place by means of a thread stopper and its free end can be kept stretched in the entry nozzle by means of a holding air flow.
  • the weft thread can be held on the thread store in question by means of a finger stopper.
  • the invention has for its object to provide a method of the type defined at the outset which avoids that a defective edge zone is created on the catch side in a multicolor fabric.
  • This object is achieved according to the invention in that a weft thread (18 ', 55, 70), which has a large weft repeat, from the weft thread store (15) with an excess length (L1, L2, L3) at least equal to that in the entry channel (36', 62 , 66, 75) held thread length (L1) is supplied.
  • the subclaims to claim 1 relate to advantageous developments.
  • Another object of the invention is to create a pneumatic multicolor weaving machine for carrying out the method. According to the invention, this object is achieved by the features specified in the characterizing part of claim 7.
  • the subclaims to claim 7 make advantageous further developments.
  • a weft feed device 1 is shown on one side of a pneumatic Merhmaschine weaving machine.
  • a drive motor 2 which drives a main shaft 4 of the machine via a belt drive 3.
  • the main shaft 4 is supported in two cheeks 5 and 6 on both sides of the machine.
  • the warp beam, the heald frames, the reed, the fabric and the goods tree are identified with the reference numbers 7, 8, 9, 10 and 11, respectively.
  • a weft feed device 1 consists of three thread stores 15, 16 and 17, each of which stores a weft 18, 19 and 20. These weft threads are referred to below as weft colors 18 ', 19' and 20 '.
  • Each thread store receives its weft color from a supply spool;
  • the thread store 15 receives the weft color 18 'from a supply spool 21.
  • the weft color 18' passes through a bore in a thread winder 22 and its winding tube 23.
  • the rotating winding tube 23 winds the weft color 18 'on a conical section 24 of a stationary drum 25 of the thread store 15.
  • a beginning 27 of the thread supply 26 is countered by a holding pin 27 until the moment of entry into the weaving machine Secured slipping.
  • the holding pin 27 is controlled via a control line 28 by a pattern-programmed control device 29.
  • the rotation of the winder tube 23 is also controlled by the control device 29 via a control line 30.
  • the control device 29 is by means of a inductive sensor 31, which cooperates with a control disk 32 located on the main shaft 4 of the machine, synchronized with the weaving machine.
  • the thread length between the mouth 38 of the entry channel 36 'and a thread stopper 37 is designated L2.
  • the thread stopper 37 is controlled by the control device 29 via a line 39. If the weft color 18 'is held on the thread store 15 instead of by means of the separate thread stopper 37, this is provided with a finger stop 40.
  • the finger stopper 40 is controlled by the control device via a line 41.
  • the thread length between the mouth 38 of the entry channel 36 'and the finger stop 40 is designated L3.
  • the length L1 of the weft color 18 ' is exposed to the damaging effect of the holding air flow with a long waiting time between two entries. If the weft color consists of an easily twistable yarn, the damage can continue over the length L2 to the thread stopper 37 or over the length L3 to the finger stopper 40. In addition, the thread length L2 and L3 can have clamp marks due to the clamping pressure of the thread stopper or the finger stopper.
  • the weft color 18 'does not have to be entered for a long time. It is also assumed that the weft color 18 'is only damaged over the length L 1.
  • the shot colors 19 'and 20' are entered regularly, for example alternately. If the weft color 18 'is to be entered, the air pressure in the nozzle 36 is increased from the holding pressure to the entry pressure. At the same time, the holding finger 27 on the thread store 15 is raised by the control device 29, as a result of which the thread supply 26 thereon is released. The thread stopper 37 is also raised by the control device 29 and the weft insertion begins.
  • the control device 29 is programmed so that the thread store 15 releases a thread length equal to the weaving width L and additionally L 1 in the nozzle 36.
  • the length L1 is therefore an excess length.
  • the weft color 18 ' is now entered by the nozzle 36 into the shed 45, ahead of the excess length L1.
  • the excess length L 1 is taken up by a stretching nozzle 46 on the catch side of the machine.
  • the weft color is then cut off on both sides of the shed 45 by scissors 47 and 48 and struck by the reed 9. It follows that the damaged length L 1 is not woven into the fabric 49. Its edge zone 50 thus remains error-free.
  • the cut excess length L 1 is discharged from the stretching nozzle 46.
  • the so-called loss length that is the length L4 of the weft color, which is inevitably always lost, is included in the excess length L1.
  • the actual loss thread length is thus only L1-L4.
  • the excess length can be cut off before the weft insertion and entering the shed. 3-6 show devices for this.
  • a weft color 55 is assumed to be entered into the shed with an excess length L 1 through a tunnel reed 56.
  • the other shot colors, e.g. 57, are without excess length to be entered.
  • a suction pipe 59 is set up vertically, the inlet 60 of which extends to just below an opening 61 of an inlet channel 62 of the nozzle.
  • a pair of scissors 63 is arranged between the mouth 61 of the entry channel 62 and the inlet 60 of the suction pipe 59. If the weft color 55 is to be entered, the control device 29 controls the thread store 15 in such a way that it first releases the excess length L 1.
  • the excess length L 1 is simultaneously detected when leaving the mouth 61 of the entry channel 62 of the nozzle 58 and appears in front of the inlet 60 of the suction pipe 59, deflected and sucked up. After the excess length L 1 has been added to the suction pipe, it is cut off by the scissors 63. Now the control device 29 causes the thread store 15 to release the entire weft color length for insertion. The extension-side stretch nozzle takes up the normal loss length L4 of the weft color. The process described is basically the same if the weft color 55 is to be entered with the excess length L 1 or L 3.
  • the thread store is to be controlled accordingly by the control device.
  • the suction tube can be slidably mounted along the nozzle 58, so that it can be installed as required in front of the entry channel which carries a weft color with a large repeat pattern.
  • a suction pipe can be arranged in front of each inlet channel, which can be pressurized with negative pressure as required.
  • an entry nozzle 65 with entry channels 66 lying one above the other is shown.
  • a suction pipe or suction pipes 67 extend accordingly in the horizontal direction. The mode of operation is the same as described for FIG. 3.
  • the weft paint to be deflected is sucked in by a suction pipe and at the same time directed by a blowing pipe against the suction pipe.
  • a suction channel 72 In a block 71 there is a suction channel 72, the inlet 73 of which lies in front of an opening 74 of an inlet channel 75 of an inlet nozzle 76. Blown air flows into the block 71 through a second duct 77. The blown air flows through a branch 78 into the suction duct 72 and causes a suction effect at the entrance 73 thereof by ejection action.
  • a second branch 79 from the blow duct 77 leads through a blower tube 80 which leads to the nozzle 76 overlaps and ends on the other side with its mouth 81 in front of the mouth 74 of the entry channel 75.
  • the excess length L 1 to be deflected and extracted is, as soon as it leaves the entry channel 75, at the same time detected by the blown air from the blow pipe 80 and the suction effect at the inlet 73 of the suction channel 72 and conveyed into the suction channel. As soon as the excess length L 1 has been recorded, it is cut off by scissors 82. The shot color 70 is then entered.

Description

Die Erfindung betrifft ein Verfahren zum Eintragen von Schussfäden in eine pneumatischen Mehrfarben-Webmaschine (siche Z.B.GB-A-2 151 266), in der für jede Schussfarbe ein Fadenspeicher vorhanden ist, wobei vor dem Eintragen eines Schussfadens einer bestimmten Schussfarbe dieser mittels eines Fadenstoppers festgehalten wird und von einem Halteluftstrom in einem Eintragskanal einer Mehrfarben-Eintragsdüse gestreckt gehalten wird.The invention relates to a method for inserting weft threads into a pneumatic multi-color weaving machine (siche ZBGB-A-2 151 266), in which a thread store is available for each weft color, wherein before the insertion of a weft thread of a certain weft color, this is done by means of a thread stopper is held and is held stretched by a holding air flow in an entry channel of a multicolor entry nozzle.

Die Erfindung betrifft weiterhin eine pneumatische Mehrfarben-Webmaschine zur Durchführung des Verfahrens.The invention further relates to a pneumatic multi-color weaving machine for performing the method.

Bei einer pneumatischen Webmaschine kann ein momentan nicht einzutragender Schussfaden mittels eines Fadenstoppers festgehalten werden und sein freies Ende mittels eines Halteluftstromes in der Eintragsdüse gestreckt gehalten werden. Statt durch einen separat angeordneten Stopper kann der Schussfaden mittels eines Fingerstoppers auf dem betreffenden Fadenspeicher festgehalten werden.In the case of a pneumatic weaving machine, a weft thread that is currently not to be inserted can be held in place by means of a thread stopper and its free end can be kept stretched in the entry nozzle by means of a holding air flow. Instead of using a separately arranged stopper, the weft thread can be held on the thread store in question by means of a finger stopper.

Bei der Herstellung eines mehrfarbigen Gewebes kommt es vor, dass eine Schussfarbe während langer Zeit nicht eingetragen werden muss, so dass sie während dieser langen Zeit durch den Halteluftstrom beschädigt werden kann. Dabei kann das in der Düse liegende Ende des Schussfadens durch den Halteluftstrom sogar aufgelöst werden. Ausserdem kann der Fadenstopper bzw. Fingerstopper Klemmarken am Fadenende verursachen. In der Folge entstehen fehlerhafte Stellen in der fangseitigen Randzone des Gewebes, was eine Qualitätsverminderug bedeutet.When producing a multi-colored fabric, it happens that a weft color does not have to be entered for a long time, so that it can be damaged by the holding air flow during this long time. The end of the weft thread lying in the nozzle can pass through the Holding air flow can even be resolved. In addition, the thread stopper or finger stopper can cause marks on the end of the thread. As a result, defective areas arise in the edge zone of the fabric on the catch side, which means a reduction in quality.

Der Erfindung liegt die Aufgabe zugrunde, eine Verfahren der eingangs definierten Art zu schaffen, das vermeidet, dass in einem Mehrfarbengewebe fangseitig eine fehlerhafte Randzone entsteht. Diese Aufgabe wird erfindungsgemäss dadurch gelöst, dass ein Schussfaden (18′, 55, 70), der einen grossen Schussrapport aufweist, vom Schussfadenspeicher (15) mit einer Ueberlänge (L₁, L₂, L₃) mindestens gleich der im Eintragskanal (36′, 62, 66, 75) gehaltenen Fadenlänge (L₁) geliefert wird. Die Unteransprüche zu Anspruch 1 betreffen vorteilhafte Weiterbildungen.The invention has for its object to provide a method of the type defined at the outset which avoids that a defective edge zone is created on the catch side in a multicolor fabric. This object is achieved according to the invention in that a weft thread (18 ', 55, 70), which has a large weft repeat, from the weft thread store (15) with an excess length (L₁, L₂, L₃) at least equal to that in the entry channel (36', 62 , 66, 75) held thread length (L₁) is supplied. The subclaims to claim 1 relate to advantageous developments.

Der Erfindung liegt weiterhin die Aufgabe zugrunde, eine pneumatische Mehrfarben-Webmaschine zum Durchführen des Verfahrens zu schaffen. Diese Aufgabe wird erfindungsgemäss durch die im Kennzeichen des Anspruchs 7 angegebenen Merkmale gelöst. Die Unteransprüche zu Anspruch 7 treffen vorteilhafte Weiterbildungen.Another object of the invention is to create a pneumatic multicolor weaving machine for carrying out the method. According to the invention, this object is achieved by the features specified in the characterizing part of claim 7. The subclaims to claim 7 make advantageous further developments.

Einige Ausführungsbeispiele des Erfindungsgegenstandes sind nachfolgend anhand der Zeichnungen beschrieben. Es ist:

  • Fig. 1 eine Uebersichtszeichung einer pneumatischer Mehrfarben-Webmaschine;
  • Fig. 2 eine schematische Draufsicht auf die Webmaschine;
  • Fig. 3 eine Ausführungsform der Schussfadenvorlage
  • Fig. 4 eine gegenüber Fig. 3 abgewandelte Ausführungsform;
  • Fig. 5 eine weitere Ausführungsform;
  • Fig. 6 die Draufsicht in Fig. 5;
Some exemplary embodiments of the subject matter of the invention are described below with reference to the drawings. It is:
  • 1 is an overview drawing of a pneumatic multicolor weaving machine;
  • 2 shows a schematic top view of the weaving machine;
  • Fig. 3 shows an embodiment of the weft thread template
  • Fig. 4 a modified compared to Fig. 3 Embodiment;
  • 5 shows a further embodiment;
  • Fig. 6 is the top view in Fig. 5;

Nach Fig. 1 ist auf der einen Seite einer pneumatischen Merhfarben-Webmaschine eine Schussfadenliefervorrichtung 1 dargestellt. Auf derselben Seite befindet sich ein Antriebsmotor 2, der über einen Riementrieb 3 eine Hauptwelle 4 der Maschine antreibt. Die Hauptwelle 4 ist in zwei Wangen 5 und 6 beidseits der Maschine gelagert. Der Kettbaum, die Webschäfte, das Riet, das Gewebe und der Warenbaum sind jeweils mit den Bezugsnummern 7, 8, 9, 10 und 11 bezeichnet.According to FIG. 1, a weft feed device 1 is shown on one side of a pneumatic Merhfarben weaving machine. On the same side there is a drive motor 2 which drives a main shaft 4 of the machine via a belt drive 3. The main shaft 4 is supported in two cheeks 5 and 6 on both sides of the machine. The warp beam, the heald frames, the reed, the fabric and the goods tree are identified with the reference numbers 7, 8, 9, 10 and 11, respectively.

Wie die Fig. 2 ersichtlich, besteht eine Schussfadenliefervorrichtung 1 aus drei Fadenspeichern 15, 16 und 17, die jeweils einen Schussfaden 18, 19 und 20 speichern. Diese Schussfäden sind nachfolgend als Schussfarben 18′, 19′ und 20′ bezeichnet. Jeder Fadenspeicher bezieht seine Schussfarbe von einer Vorlagespule; z.B. bezieht der Fadenspeicher 15 die Schussfarbe 18′ von einer Vorlagespule 21. Die Schussfarbe 18′ durchläuft eine Bohrung in einem Fadenwickler 22 und dessen Wickelrohr 23. Das rotierende Wickelrohr 23 wickelt die Schussfarbe 18′ auf einen konischen Abschnitt 24 einer stillstehenden Trommel 25 des Fadenspeichers 15. Dabei gleiten die aufgelegten Windungen der Schussfarbe 18′ nacheinander von dem konischen Abschnitt 24 ab und auf die Trommel 15 und bilden darauf einen Fadenvorrat 26. Ein Anfang 27 des Fadenvorrats 26 wird von einem Haltestift 27 bis zum Moment des Eintragens in die Webmaschine gegen Abrutschen gesichert. Der Haltestift 27 wird über eine Steuerleitung 28 von einer musterprogrammierten Steuervorrichtung 29 gesteuert. Auch die Rotation des Wicklerrohres 23 wird über eine Steuerleitung 30 von der Steuervorrichtung 29 gesteuert. Die Steuervorrichtung 29 wird mittels eines induktiven Sensors 31, der mit einer auf der Hauptwelle 4 der Maschine befindliche Steuerscheibe 32 zusammenwirkt, mit der Webmaschine synchronisiert. Die Schussfarbe 18′ erreicht, von der Trommel 25 kommend und eine Fadenöse 35 durchlaufend, eine Mehrfach-Eintragsdüse 36 und wird darin mit einer Länge L₁ in einem Eintragskanal 36′ bis zur nächsten Eintragung mittels eines Halteluftstromes gestreckt gehalten. Die Fadenlänge zwischen der Mündung 38 des Eintragskanals 36′ und einem Fadenstopper 37 ist mit L₂ bezeichnet. Der Fadenstopper 37 wird über eine Leitung 39 von der Steuervorrichtung 29 gesteuert. Wird die Schussfarbe 18′ statt mittels des separaten Fadenstoppers 37 auf dem Fadenspeicher 15 festgehalten, so ist dieser mit einem Fingerstopper 40 versehen. Der Fingerstopper 40 wird über eine Leitung 41 von der Steuervorrichtung gesteuert. Die Fadenlänge zwischen der Mündung 38 des Eintragskanals 36′ und dem Fingerstopper 40 ist mit L₃ bezeichnet.2, a weft feed device 1 consists of three thread stores 15, 16 and 17, each of which stores a weft 18, 19 and 20. These weft threads are referred to below as weft colors 18 ', 19' and 20 '. Each thread store receives its weft color from a supply spool; For example, the thread store 15 receives the weft color 18 'from a supply spool 21. The weft color 18' passes through a bore in a thread winder 22 and its winding tube 23. The rotating winding tube 23 winds the weft color 18 'on a conical section 24 of a stationary drum 25 of the thread store 15. The applied windings of the weft color 18 'slide one after the other from the conical section 24 and onto the drum 15 and form a thread supply 26. A beginning 27 of the thread supply 26 is countered by a holding pin 27 until the moment of entry into the weaving machine Secured slipping. The holding pin 27 is controlled via a control line 28 by a pattern-programmed control device 29. The rotation of the winder tube 23 is also controlled by the control device 29 via a control line 30. The control device 29 is by means of a inductive sensor 31, which cooperates with a control disk 32 located on the main shaft 4 of the machine, synchronized with the weaving machine. The weft color 18 'reached, coming from the drum 25 and passing through a thread eyelet 35, a multiple entry nozzle 36 and is kept stretched therein with a length L 1 in an entry channel 36' until the next entry by means of a holding air flow. The thread length between the mouth 38 of the entry channel 36 'and a thread stopper 37 is designated L₂. The thread stopper 37 is controlled by the control device 29 via a line 39. If the weft color 18 'is held on the thread store 15 instead of by means of the separate thread stopper 37, this is provided with a finger stop 40. The finger stopper 40 is controlled by the control device via a line 41. The thread length between the mouth 38 of the entry channel 36 'and the finger stop 40 is designated L₃.

Die Länge L₁ der Schussfarbe 18′ ist bei langer Wartezeit zwischen zwei Eintragungen der schädigenden Wirkung des Halteluftstromes ausgesetzt. Besteht die Schussfarbe aus einem leicht aufdrehbaren Garn, kann der Schaden sich über die Länge L₂ bis zum Fadenstopper 37 bzw. über die Länge L₃ bis zum Fingerstopper 40 fortsetzen. Ausserdem können die Fadenlänge L₂ und L₃ Klemmarken aufweisen infolge des Klemmdruckes des Fadenstoppers bzw. des Fingerstoppers.The length L₁ of the weft color 18 'is exposed to the damaging effect of the holding air flow with a long waiting time between two entries. If the weft color consists of an easily twistable yarn, the damage can continue over the length L₂ to the thread stopper 37 or over the length L₃ to the finger stopper 40. In addition, the thread length L₂ and L₃ can have clamp marks due to the clamping pressure of the thread stopper or the finger stopper.

Zur Erklärung des zur Anwendung kommenden Verfahrens sei angenommen, dass nur die Schussfarbe 18′ über lange Zeit nicht eingetragen werden muss. Es sei weiterhin angenommen, dass die Schussfarbe 18′ nur über die Länge L₁ beschädigt ist. Die Schussfarben 19′ und 20′ werden regelmässig eingetragen, z.B. wechselweise. Wenn die Schussfarbe 18′ eingetragen werden soll, so wird der Luftdruck in der Düse 36 vom Haltedruck auf Eintragsdruck gesteigert. Gleichzeitig wird der Haltefinger 27 auf dem Fadenspeicher 15 von der Steuervorrichtung 29 angehoben, wodurch der Fadenvorrat 26 darauf freigegeben wird. Der Fadenstopper 37 wird ebenfalls von der Steuervorrichtung 29 angehoben, und der Schusseintrag beginnt. Die Steuervorrichtung 29 ist so programmiert, dass der Fadenspeicher 15 eine Fadenlänge gleich der Webbreite L und zusätzlich L₁ in der Düse 36 freigibt. Die Länge L₁ ist somit eine Ueberlänge. Die Schussfarbe 18′ wird nun von der Düse 36 in das Webfach 45 eingetragen, voraus die Ueberlänge L₁. Die Ueberlänge L₁ wird von einer Streckdüse 46 auf der Fangseite der Maschine aufgenommen. Daraufhin wird die Schussfarbe auf beiden Seiten des Webfaches 45 von einer Schere 47 bzw. 48 abgeschnitten und vom Riet 9 angeschlagen. Es folgt, dass die beschädigte Länge L₁ nicht in das Gewebe 49 eingewoben wird. Seine Randzone 50 bleibt somit fehlerfrei. Die abgeschnittene Ueberlänge L₁ wird von der Streckdüse 46 abgeführt. Wie ersichtlich ist die sogenannte Verlustlänge, das ist die Länge L₄ der Schussfarbe, die unvermeidlicherweise immer verlorengeht, in der Ueberlänge L₁ enthalten. Die tatsächliche Verlustfadenlänge beträgt somit nur L₁-L₄.To explain the method used, it is assumed that only the weft color 18 'does not have to be entered for a long time. It is also assumed that the weft color 18 'is only damaged over the length L 1. The shot colors 19 'and 20' are entered regularly, for example alternately. If the weft color 18 'is to be entered, the air pressure in the nozzle 36 is increased from the holding pressure to the entry pressure. At the same time, the holding finger 27 on the thread store 15 is raised by the control device 29, as a result of which the thread supply 26 thereon is released. The thread stopper 37 is also raised by the control device 29 and the weft insertion begins. The control device 29 is programmed so that the thread store 15 releases a thread length equal to the weaving width L and additionally L 1 in the nozzle 36. The length L₁ is therefore an excess length. The weft color 18 'is now entered by the nozzle 36 into the shed 45, ahead of the excess length L₁. The excess length L 1 is taken up by a stretching nozzle 46 on the catch side of the machine. The weft color is then cut off on both sides of the shed 45 by scissors 47 and 48 and struck by the reed 9. It follows that the damaged length L 1 is not woven into the fabric 49. Its edge zone 50 thus remains error-free. The cut excess length L 1 is discharged from the stretching nozzle 46. As can be seen, the so-called loss length, that is the length L₄ of the weft color, which is inevitably always lost, is included in the excess length L₁. The actual loss thread length is thus only L₁-L₄.

Hat die Schussfarbe 18′ auch über die Länge L₂ bzw. L₃ Schaden genommen, so wird sie mit dieser Ueberlänge auf die oben beschriebene Weise eingetragen. Die Ueberlänge wird wiederum in der Streckdüse 46 aufgenommen und bis zum Abschneiden durch die Schere 48 gestreckt gehalten.Has the weft color 18 'also damaged over the length L₂ or L₃, it is entered with this excess length in the manner described above. The excess length is again taken up in the stretching nozzle 46 and kept stretched until it is cut off by the scissors 48.

Statt die Ueberlänge L₁, L₂ oder L₃ der Schussfarbe nach der Eintragung auf der Fangseite der Maschine abzuschneiden, kann die Ueberlänge vor dem Schusseintrag und dem Eintreten in das Webfach abgeschnitten werden. Die Fig. 3 - 6 zeigen Vorrichtungen dazu.Instead of cutting off the excess length L₁, L₂ or L₃ of the weft color after the entry on the catch side of the machine, the excess length can be cut off before the weft insertion and entering the shed. 3-6 show devices for this.

Beim Ausführungsbeispiel nach Fig. 3 ist von einer Schussfarbe 55 angenommen, dass sie mit einer Ueberlänge L₁ durch ein Tunnelriet 56 in das Webfach einzutragen ist. Die anderen Schussfarben, z.B. 57, sind ohne Ueberlänge einzutragen. Am Ende einer Eintragsdüse 58 ist ein Saugrohr 59 vertikal aufgestellt, dessen Eingang 60 bis gerade unterhalb einer Mündung 61 eines Eintragskanals 62 der Düse reicht. Zwischen der Mündung 61 des Eintragskanals 62 und dem Eingang 60 des Saugrohres 59 ist eine Schere 63 angeordnet. Soll die Schussfarbe 55 eingetragen werden, so steuert die Steuervorrichtung 29 den Fadenspeicher 15 derart, dass dieser zunächst die Ueberlänge L₁ freigibt. Die Ueberlänge L₁ wird aber gleichzeitig beim Verlassen der Mündung 61 des Eintragskanals 62 der Düse 58 und Erscheinen vor dem Eingang 60 des Saugrohres 59 von diesem erfasst, abgelenkt und aufgesaugt. Nachdem die Ueberlänge L₁ in das Saugrohr aufgenommen worden ist, wird sie von der Schere 63 abgeschnitten. Jetzt veranlasst die Steuervorrichtung 29, dass der Fadenspeicher 15 die ganze Schussfarbenlänge zum Eintragen freigibt. Die fangseitige Streckdüse nimmt die normale Verlustlänge L₄ der Schussfarbe auf. Der beschriebene Vorgang ist sinngemäss gleich, wenn die Schussfarbe 55 mit der Ueberlänge L₁ oder L₃ einzutragen ist.In the exemplary embodiment according to FIG. 3, a weft color 55 is assumed to be entered into the shed with an excess length L 1 through a tunnel reed 56. The other shot colors, e.g. 57, are without excess length to be entered. At the end of an inlet nozzle 58, a suction pipe 59 is set up vertically, the inlet 60 of which extends to just below an opening 61 of an inlet channel 62 of the nozzle. A pair of scissors 63 is arranged between the mouth 61 of the entry channel 62 and the inlet 60 of the suction pipe 59. If the weft color 55 is to be entered, the control device 29 controls the thread store 15 in such a way that it first releases the excess length L 1. The excess length L 1 is simultaneously detected when leaving the mouth 61 of the entry channel 62 of the nozzle 58 and appears in front of the inlet 60 of the suction pipe 59, deflected and sucked up. After the excess length L 1 has been added to the suction pipe, it is cut off by the scissors 63. Now the control device 29 causes the thread store 15 to release the entire weft color length for insertion. The extension-side stretch nozzle takes up the normal loss length L₄ of the weft color. The process described is basically the same if the weft color 55 is to be entered with the excess length L 1 or L 3.

Es ist nicht notwendig, die Ueberlänge gerade vor dem Eintragen der Schussfarbe abzusaugen und abzuschneiden. Dies kann bereits einige Webzyklen vorher geschehen. Der Fadenspeicher ist entsprechend von der Steuervorrichtung zu steuern.It is not necessary to vacuum and cut off the excess length just before entering the shot color. This can happen a few weaving cycles beforehand. The thread store is to be controlled accordingly by the control device.

Das Saugrohr kann verschiebbar entlang der Düse 58 angebracht sein, so dass es nach Bedarf vor demjenigen Eintragskanal montiert werden kann, der eine Schussfarbe mit grossem Schussrapport führt. Selbstverständlich kann vor jedem Eintragskanal ein Saugrohr angeordnet werden, das nach Bedarf mit Unterdruck beaufschlagt wird.The suction tube can be slidably mounted along the nozzle 58, so that it can be installed as required in front of the entry channel which carries a weft color with a large repeat pattern. Of course, a suction pipe can be arranged in front of each inlet channel, which can be pressurized with negative pressure as required.

Beim Ausführungsbeispiel nach Fig. 4 ist eine Eintragsdüse 65 mit übereinanderliegenden Eintragskanälen 66 dargestellt. Ein Saugrohr bzw. Saugrohre 67 erstrecken sich dementsprechend in horizontaler Richtung. Die Arbeitsweise ist dieselbe für wie für Fig. 3 beschrieben.In the exemplary embodiment according to FIG. 4, an entry nozzle 65 with entry channels 66 lying one above the other is shown. A suction pipe or suction pipes 67 extend accordingly in the horizontal direction. The mode of operation is the same as described for FIG. 3.

Beim Ausführungsbeispiel nach Fig. 5 und 6 wird die abzulenkende Schussfarbe von einem Saugrohr angesaugt und gleichzeitig von einem Blasrohr gegen das Saugrohr gelenkt. Dies sei für die Schussfarbe 70 erklärt. In einem Block 71 ist ein Saugkanal 72 angebracht, dessen Eingang 73 sich vor einer Mündung 74 eines Eintragskanals 75 einer Eintragsdüse 76 legt. Durch einen zweiten Kanal 77 strömt Blasluft in den Block 71. Die Blasluft strömt durch eine Abzweigung 78 in den Saugkanal 72 und verursacht durch Ejektionswirkung eine Saugwirkung an dessen Eingang 73. Eine zweite Abzweigung 79 vom Blaskanal 77 führt durch ein Blasrohr 80, das die Düse 76 übergreift und auf der anderen Seite mit seiner Mündung 81 vor der Mündung 74 des Eintragskanals 75 endet. Die abzulenkende und abzusaugende Ueberlänge L₁ der Schussfarbe 70 wird, sobald sie den Eintragskanal 75 verlässt, gleichzeitig von der Blasluft aus dem Blasrohr 80 und der Saugwirkung am Eingang 73 des Saugkanals 72 erfasst und in den Saugkanal befördert. Sobald die Ueberlänge L₁ aufgenommen worden ist, wird sie von einer Schere 82 abgeschnitten. Danach wird die Schussfarbe 70 eingetragen.In the embodiment according to FIGS. 5 and 6, the weft paint to be deflected is sucked in by a suction pipe and at the same time directed by a blowing pipe against the suction pipe. This is explained for the shot color 70. In a block 71 there is a suction channel 72, the inlet 73 of which lies in front of an opening 74 of an inlet channel 75 of an inlet nozzle 76. Blown air flows into the block 71 through a second duct 77. The blown air flows through a branch 78 into the suction duct 72 and causes a suction effect at the entrance 73 thereof by ejection action. A second branch 79 from the blow duct 77 leads through a blower tube 80 which leads to the nozzle 76 overlaps and ends on the other side with its mouth 81 in front of the mouth 74 of the entry channel 75. The excess length L 1 to be deflected and extracted is, as soon as it leaves the entry channel 75, at the same time detected by the blown air from the blow pipe 80 and the suction effect at the inlet 73 of the suction channel 72 and conveyed into the suction channel. As soon as the excess length L 1 has been recorded, it is cut off by scissors 82. The shot color 70 is then entered.

Claims (12)

1. A weft yarn picking method for a multicolour air jet loom having a weft yarn accumulator for each weft colour wherein before the picking of any weft yarn of a particular weft colour such yarn is retained by means of a yarn stopper and kept stretched by a retaining flow of air in a picking chamber of a multicolour picking nozzle, characterised in that a weft yarn (18′, 55, 70) having a large weft repeat is delivered by the weft yarn accumulator (15) with an overlength (L₁, L₂, L₃) at least equal to the yarn length (L₁) retained in the picking channel (36′, 62, 66, 75).
2. A method according to claim 1, the weft yarns each being retained by means of a yarn stopper between the weft accumulator and the picking nozzle, characterised in that the overlength is equal to the length (L₂) of the weft yarn (18′) between the entry (38) of the picking channel (36′) and the particular yarn stopper (37) concerned.
3. A method according to claim 1, the weft yarns each being retained by means of a finger stopper on the yarn accumulator, characterised in that the overlength is equal to the length (L₃) of the weft yarn (18′) between the entry (38) of the picking channel (36′) and the finger stopper (40) on the yarn accumulator (15).
4. A method according to any of claims 1 to 3, characterised in that the overlength (L₁, L₂, L₃) is severed on the catching side after the picking of the weft yarn (18′).
5. A method according to any of claims 1 to 3, characterised in that the overlength (L₁, L₂, L₃) is deflected from the picking line, severed and removed before the picking of the weft yarn (18′).
6. A method according to claim 5, characterised in that the overlength (L₁, L₂, L₃) is deflected and severed at least one weaving cycle before the picking of the weft colour (55; 70).
7. A multicolour air jet loom for the practice of the method according to claim 5 comprising one weft yarn accumulator for each weft colour, the multiple picking nozzle in which the weft yarns are each retained by a retaining air flow in a picking channel before being picked into the loom, and having yarn stoppers for retaining the weft yarns, characterised in that outside the entry (61; 74) of the picking channel (62; 75) of the picking nozzle (58; 76), the latter channel retaining the weft colour (55; 70) having a large weft repeat, a suction tube (59; 72) is disposed transversely of such nozzle end the suction tube input (60. 73) is disposed near the entry (61, 74) of the picking channel and a separator (63; 82) for the largerepeat weft colour is disposed between the inlet of the picking channel (62, 75) and the entry of the suction tube.
8. A loom according to claim 7, characterised in that the suction tube (59; 72) is displaceably relatively to the inlets (61; 74) of the picking channels (62; 75).
9. A loom according to claim 7, characterised in that a blowing tube (80) has its entry (81) disposed opposite the entry (73) of the suction tube (72).
10. A loom according to claim 9, characterised in that the blowing tube (80) and the suction tube (72) are in the form of channels in a block (71) extending transversely to the picking nozzle (76), some of the block (72) with the blowing tube (80) extending over the picking nozzle.
11. A loom according to claim 10, characterised in that the blowing duct (80) is connected by way of a communicating duct (78) to the suction duct (72) which acts as ejector for the suction duct.
12. A loom according to claim 10 or 11, characterised in that the block (71) can be so moved relatively to the picking nozzle that the suction duct (72) and the blowing duct (80) are each disposed opposite a different inlet (74) of a picking duct (75).
EP88810399A 1987-06-25 1988-06-13 Process for weft insertion in a pneumatic multicolor loom and loom to execute that process Expired - Lifetime EP0297040B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH2391/87 1987-06-25
CH239187 1987-06-25

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EP0297040B1 true EP0297040B1 (en) 1991-06-26

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EP (1) EP0297040B1 (en)
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JPH0247338A (en) * 1988-08-06 1990-02-16 Nissan Motor Co Ltd Weft treatment of weaving machine of fluid jet type
EP0389410A1 (en) * 1989-03-17 1990-09-26 Sulzer RàœTi Ag Weft threading system for a loom
EP0421511A1 (en) * 1989-10-04 1991-04-10 Picanol N.V. Method and device for feeding weft threads to the shed in airjet weaving machines
US5501250A (en) * 1994-11-22 1996-03-26 E. I. Du Pont De Nemours And Company Method for deleting and reintroducing yarns to a textile process
DE10224078A1 (en) * 2002-05-31 2003-12-18 Dornier Gmbh Lindauer Process for keeping a weft thread straight and weaving machine for carrying out the process
JP2005539161A (en) * 2002-09-18 2005-12-22 リンダウェル、ドルニエ、ゲゼルシャフト、ミット、ベシュレンクテル、ハフツング Weft holding method and in particular jet loom for carrying out the method
CN102877194B (en) * 2012-09-29 2014-03-05 浙江三禾纺织机械有限公司 Control system and control method for pattern precognition of weft accumulators
US9487887B1 (en) * 2013-03-13 2016-11-08 Jonathan Grossman Systems and methods for manufacturing textiles

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DE3203876A1 (en) * 1982-02-05 1983-08-18 Guenne Webmaschf Gmbh DEVICE FOR SEPARATE AND / OR JOINTLY BLOWING IN VARIOUS COLORED Weft Threads IN AIR JET WAVING MACHINES
KR860002101B1 (en) * 1982-05-11 1986-11-25 가부시기 가이샤 도요다 지도우 쇽기세이사꾸쇼 Weft operating method & apparatus in jet loom
JPS5966540A (en) * 1982-10-02 1984-04-16 株式会社豊田自動織機製作所 Prevention of defect weaving of weft yarn in shuttleless lo-om
FR2556375B1 (en) * 1983-12-13 1986-06-20 Saurer Diederichs Sa COMPRESSED AIR SUPPLY DEVICE FOR A WEAVING MACHINE WITH PNEUMATIC INSERTION OF AT LEAST TWO WEFT YARNS
FR2556749B1 (en) * 1983-12-20 1986-04-11 Alsacienne Constr Mat Tex PROCESS AND DEVICE FOR THE PREPARATION AND MEASUREMENT OF DETERMINED WEFT LENGTHS IN MULTIDUIT WOVEN
CH662136A5 (en) * 1984-01-19 1987-09-15 Rueti Te Strake Bv METHOD FOR OPERATING A WEAVING MACHINE AND DEVICE FOR CARRYING OUT THE METHOD.
JPH07858B2 (en) * 1985-02-21 1995-01-11 株式会社豊田中央研究所 Control device for a plurality of weft yarn selective storage devices in a jet turm
NL8503439A (en) * 1985-12-13 1987-07-01 Picanol Nv APPARATUS FOR SUPPLYING A WAVE THREAD TO A MAIN BLOWER AT WEAVING MACHINES.

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EP0297040A1 (en) 1988-12-28
DE3863397D1 (en) 1991-08-01
US4915144A (en) 1990-04-10
JPS6420356A (en) 1989-01-24
BR8803122A (en) 1989-01-24

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